Announcements of Opportunity (AOs)


ESA runs annual Announcements of Opportunity (AOs) for the CHEOPS Guest Observers (GO) Programme. These are open to the worldwide science community, and all reserarch topics applicable to CHEOPS are encouraged. With the start of CHEOPS first extended mission on 25 September 2023, ESA strives to run these AO Calls in a fully double-anonymous peer-review. Please carefully consult the relevant webpage for each AO Call, and in particular its Policies & Procedures Document, the Observers Manual, and the Frequently Asked Questions (FAQ) webpage.

You can find the current AO-5 Call here.

You can also find previous AOs and overviews of their awarded proposals here.

Happy observing!



Questions about CHEOPS or the GO Programme? Please email cheops-support at and we will be happy to help!
This website was last updated on 2 July 2024.